The Marines are no longer able to access social networking services. The following graphic shows the official statement published online and in all capital letters:
THESE INTERNET SITES IN GENERAL ARE A PROVEN HAVEN FOR MALICIOUS ACTORS AND CONTENT AND ARE PARTICULARLY HIGH RISK DUE TO INFORMATION EXPOSURE, USER GENERATED CONTENT AND TARGETING BY ADVERSARIES. THE VERY NATURE OF SNS CREATES A LARGER ATTACK AND EXPLOITATION WINDOW, EXPOSES UNNECESSARY INFORMATION TO ADVERSARIES AND PROVIDES AN EASY CONDUIT FOR INFORMATION LEAKAGE THAT PUTS OPSEC, COMSEC, PERSONNEL AND THE MCEN AT AN ELEVATED RISK OF COMPROMISE. EXAMPLES OF INTERNET SNS SITES INCLUDE FACEBOOK, MYSPACE, AND TWITTER.
At the same time, DoD and the U.S. Strategic Command are discussing weather they should restrict or ban social networking services ]. You can join the discussion on the Army Live blog (which will also be block for internal access in case the ban will come through) or on Twitter with @USArmy:
Read the full story on Wired.com by Noah Shachtman: Marines Ban Twitter, MySpace, Facebook
Here is the response of @thejointstaff (Adm. Mike Mullen):
Update (August 7, 2009): See NextGov article: “Marines and Social Nets: We Goofed” => Not sure what to believe… Marines seem still be allowed to use social media on their personal accounts. But they are reinforcing to ban “access to social Web sites on Defense networks to conserve bandwidth for operational requirements.”